The game's "crushing" mechanic has the player switching in between 2D and 3D at will, crushing and collecting as they try to navigate to the exit of each stage. Don't think it'll be a walk in the park, however. Crush 3D is difficult. But it's the good, rewarding kind of difficult. The kind that lets you sit and marvel at your accomplishment after it's been completed.
If you enjoyed the old PSP version of Crush and you own a 3DS, keep an eye out for Crush 3D, out on March 6th in the US.